Gil Select Sound HP Silencers
Select Sound HP Silencers offer the latest in silencing technology for high performance, big block engines. The HP is designed to route exhaust downward after sound baffling for maximum nose reduction. And like the standard Gil Select Sound Silencer, the HP allows boaters to switch to unsilenced performance with the flip of a switch on the dashboard for full exhaust flow. Select Sound HP Silencers are designed for 4" and 4.5" exhaust systems. They're available in clamp-on or transom mount styles. And our polished stainless steel finish offers an attractive and durable high performance look.

Hardin Marine has just introduced their latest performance mufflers, the XPM525. These new silencers address the J-2005 SAE test that is now the standard in many states including California. In a recent independent test, these silencers showed a 12.2-decibel noise reduction at idle speed when mounted on the Mercury 525 engine package. This brought the test boat down to 88db passing the stringent California noise ordinance enacted this year. When installed on a test boat equipped with the 496 engine package, the mufflers brought it down to 88db.

316L Stainless Steel

6" flange and three bolt pattern

4" hose

15-1/2” in overall length

flange to inside: 5-1/2"

flange to outside: 10"

The XPM525’s are constructed entirely from 316L stainless steel in order to provide the maximum corrosion resistance available in saltwater applications. These mufflers do not have any moving parts or packing to wear out. The significant sound reduction is accomplished with a 5-inch 2-phase expansion chamber in conjunction with a center sound wave baffle. The unique down-turned design helps to keep spray and carbon residue from accumulating on the boats transom. Heavy-duty external exhaust flappers are included to prevent any chance of water ingestion through the exhaust system.

Installation is simple. The Transom mount XPM525 muffler system is designed to mount like standard exhaust tip with it's conventional 6" flange and three bolt pattern. The hose connection if for a 4" hose.The mufflers are 15-1/2” in overall length. 10" Out from flange and 5-1/2"in.

The meticulous hand polished finish bring these mufflers to a show quality shine making them a beautiful addition to any boat while maintaining their necessary functionality. Sold in pairs.

This silencer system was specifically designed and tested to comply with the J-2005 SAE testing standards that are being rigorously implemented on national waterways. The apparent problem that the Mercury 496 & 496HO is an open exhaust configuration that does not comply with the latest noise level limits required by law. This can now be rectified with these direct replacement silencers. In recent testing by "Hot Boat" magazine this system dropped the noise level to a legal 85/86 decibels.

These silencers are 100% stainless steel and are perfect for
both stock and slightly modified engines There are no moving parts
and they come in a brilliant polished finish These silencers are
called part-time because by simply removing one bolt per tip you
can remove the slip-in silencers and have straight through
exhaust Approximately an 8 to 10 decibel reduction is achieved with these silencers installed.

Available in your choice of straight or angle cut styles. All tips require a 4" mounting hole while providing the appropriate exhaust hose connection size.

These silencers are 100% stainless steel and are perfect forboth stock and slightly modified engines There are no moving partsand they come in a brilliant polished finish These silencers arecalled part-time because by simply removing one bolt per tip youcan remove the slip-in silencers and have straight throughexhaust Approximately an 8 to 10 decibel reduction is achieved with these silencers installed.

Available in your choice of straight or angle cut styles. All tips require a 4" mounting hole while providing the appropriate exhaust hose connection size.

These silencers are 100% stainless steel and are perfect for
both stock and slightly modified engines There are no moving parts
and they come in a brilliant polished finish These silencers are
called part-time because by simply removing one bolt per tip you
can remove the slip-in silencers and have straight through
exhaust Approximately an 8 to 10 decibel reduction is achieved with these silencers installed.

Available in your choice of straight or angle cut styles. All tips require a 4" mounting hole while providing the appropriate exhaust hose connection size.

These silencers are 100% stainless steel and are perfect forboth stock and slightly modified engines There are no moving partsand they come in a brilliant polished finish These silencers arecalled part-time because by simply removing one bolt per tip youcan remove the slip-in silencers and have straight throughexhaust Approximately an 8 to 10 decibel reduction is achieved with these silencers installed.

Available in your choice of straight or angle cut styles. All tips require a 4" mounting hole while providing the appropriate exhaust hose connection size.

These silencers are 100% stainless steel and are perfect for
both stock and slightly modified engines There are no moving parts
and they come in a brilliant polished finish These silencers are
called part-time because by simply removing one bolt per tip you
can remove the slip-in silencers and have straight through
exhaust Approximately an 8 to 10 decibel reduction is achieved with these silencers installed.

These silencers are 100% stainless steel and are perfect for both stock and slightly modified engines There are no moving parts and they come in a brilliant polished finish These silencers are called part-time because by simply removing one bolt per tip you can remove the slip-in silencers and have straight through exhaust. Approximately an 8 to 10 decibel reduction is achieved with these silencers installed.

These tips extend out 3-3/4 inches past the transom ring on the inside and outside